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DM814X的引脚数目问题



您好,我从DM814x的datasheet上看到的是共BGA684个引脚,但是从目前MISTRAL的开发板原理图和PCB上看(MS_TI_CEN_BB_REVC_DDR3_PG2_SCH),共有712个引脚(多余的28个引脚都有具体网络),请问这是怎么回事 是应为工程样片的原因 实际IC引脚应该是如何,或者这样设计是基于什么考虑。。。谢谢!